P0947 – Low signal level in the hydraulic pump relay circuit

Content

P0947 – OBD-II Trouble Code Technical Description
What does trouble code P0947 mean?
Possible reasons
What are the symptoms of trouble code P0947?
How to diagnose trouble code P0947?
- Diagnostic errors
How serious is trouble code P0947?
What repairs will resolve the P0947 code?
P0947 – Brand Specific Information

P0947 – OBD-II Trouble Code Technical Description

Hydraulic Pump Relay Circuit Low

What does trouble code P0947 mean?

Trouble code P0947 indicates a problem with the solenoid valve or solenoid “B” inside the transmission hydraulic assembly. The specific description and meaning of the P0947 code may vary slightly depending on the vehicle manufacturer. However, it usually indicates the following:

P0947: Solenoid Valve “B” - Signal Low

This means that the ECU (Electronic Control Unit) has detected a low signal from the solenoid valve or solenoid “B” inside the transmission hydraulic assembly. This can be caused by a variety of problems, including electrical, mechanical, or the solenoids themselves that control shifting in the transmission.

To more accurately determine the specific cause, it is recommended that you have a qualified technician diagnose and repair the problem associated with DTC P0947.

Possible reasons

Trouble code P0947 can occur for a variety of reasons related to the solenoid valve or solenoid “B” inside the transmission hydraulic assembly. Here are some possible reasons:

Solenoid valve or solenoid “B” malfunction: Problems with the solenoid valve itself or the solenoid, such as opens, shorts, or failures in the valve mechanism, can trigger the P0947 code.
Wiring problems: Opens, short circuits or damage to the wiring connecting the solenoid valve or solenoid “B” to the ECU can cause the signal to be low and trigger this code.
Problems with the transmission itself: Certain transmission problems, such as shift mechanism problems, can set DTC P0947.
Malfunctions in the electronic control unit (ECU): Problems with the ECU itself, which is responsible for controlling the operation of the transmission, can also cause this fault code to appear.

To determine the specific cause of the malfunction, it is recommended to carry out detailed diagnostics using specialized equipment or contact a qualified technician to carry out the necessary repair work.

What are the symptoms of trouble code P0947?

When DTC P0947 appears, you may experience the following symptoms:

Check Engine Light (MIL): An illuminated Check Engine Light (MIL) on your vehicle's dashboard may be the first sign of a problem.
Gearshift problems: Irregular or jerky shifts, delayed shifts, or other transmission problems may indicate that the “B” solenoid inside the transmission is not working properly.
Loss of power or deterioration in performance: Having problems with the solenoid valve or solenoid “B” can result in loss of power or poor overall vehicle performance.
Jerks when moving: Jerking or jerking of the car while driving may be the result of a transmission-related problem.
Transition to emergency mode of transmission: In some cases, the vehicle may go into emergency transmission mode to prevent possible damage.

If you notice these symptoms and your vehicle is displaying a P0947 trouble code, it is recommended that you immediately have a qualified technician diagnose and repair the problem to avoid potential serious damage to the transmission and ensure the safe operation of your vehicle.

How to diagnose trouble code P0947?

The following steps are recommended to diagnose and resolve DTC P0947:

Using an OBD-II scanner: Use an OBD-II scanner to read trouble codes and get detailed information about them. This will help identify the specific P0947 code and other related trouble codes if present.
Checking the MIL indicator: Check to see if the Check Engine Light (MIL) on your vehicle's dashboard comes on.
Visual inspection of wiring and connections: Inspect the wiring and connections associated with the solenoid valve or solenoid “B” for damage, breaks, or corrosion.
Testing Solenoid Valve or Solenoid “B”: Check the operation of the solenoid valve or solenoid “B” using a multimeter or other specialized electrical testing equipment.
Transmission diagnostics: Conduct a transmission diagnostic to rule out mechanical or electrical problems.
ECU diagnostics: Diagnose the Electronic Control Unit (ECU) itself to ensure it is functioning correctly and is not causing problems with the solenoid valve or solenoid “B”.

For a more accurate and complete diagnosis, it is recommended to contact a qualified technician or car service center specializing in the diagnosis and repair of automobile transmissions.

Diagnostic errors

When diagnosing trouble code P0947 and other automotive problems, common errors may occur including:

Insufficient wiring check: Skipping a visual inspection or testing of the wiring and connections associated with the solenoid valve or solenoid “B” may result in the problem not being diagnosed.
Ignoring diagnostic codes: Ignoring diagnostic codes or taking superficial steps to resolve them may result in the problem reoccurring in the near future.
Insufficient transmission inspection: Failure to check other transmission components not directly related to the solenoid valve or “B” solenoid may result in additional problems being missed.
Errors in interpreting scanner data: Incorrect interpretation of the data obtained from the scanner can lead to incorrect conclusions about the causes of the malfunction.
Incorrect repair or replacement of components: Improperly repairing or replacing the solenoid valve or “B” solenoid without considering other possible factors may not correct the root problem.

To avoid these mistakes, it is important to carry out a complete and thorough diagnosis using the correct tools and techniques, and to have experienced and qualified technicians repair and service your vehicle.

How serious is trouble code P0947?

Trouble code P0947 is serious because it indicates a problem with the solenoid valve or solenoid “B” inside the transmission hydraulic assembly. The transmission is a key part of the car, and any problems associated with it can significantly affect the performance and safety of the car. Several serious consequences of transmission malfunction if the P0947 code is ignored include:

Loss of transmission control: Problems with the solenoid valve or solenoid “B” can result in loss of control of the shift mechanism, which in turn can cause dangerous situations on the road.
Damage to the transmission: Prolonged neglect of the problem can lead to wear or damage to various transmission components, ultimately requiring costly repairs or replacement.
Increased fuel costs: Transmission faults can lead to increased fuel consumption due to improper functioning of the gear shift and power transmission mechanisms.

Because of this, it is recommended that you immediately have a qualified technician diagnose and repair the problem associated with DTC P0947 to prevent potential serious damage to the transmission and ensure safe operation of the vehicle.

What repairs will resolve the P0947 code?

Trouble code P0947 may require a number of repairs to resolve, including:

Replacing or repairing the solenoid valve or solenoid “B”: If the problem is a faulty valve or solenoid itself, the component may need to be replaced or repaired.
Repair or replacement of wiring: Thoroughly inspect and, if necessary, repair or replace the wiring associated with the solenoid valve or solenoid “B”.
Transmission service: Perform a complete transmission service to ensure all shift mechanisms are functioning properly.
ECU software update: In some cases, updating the ECU software may help resolve problems associated with the P0947 trouble code.
Checking and replacing other transmission components: Other transmission components, such as sensors or other solenoids, should also be checked for faults.

It is recommended that you have a qualified technician or auto repair shop perform diagnostics and repairs to resolve the P0947 code and prevent further damage to the transmission.

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